New TOC for dart-by-example page

src/site/_includes/header.html

Index: src/site/_includes/header.html
diff --git a/src/site/_includes/header.html b/src/site/_includes/header.html
index 823b6ccf19189e74460ca78d81d5dd9e0d0a920d..93a3d81985a54d066e52b4485901e8d532dade00 100644
--- a/src/site/_includes/header.html
+++ b/src/site/_includes/header.html
@@ -51,7 +51,7 @@
 
     <div class="navbar navbar-fixed-top navbar-inverse" role="navigation">
       <div class="container">
-        
+
         <div class="navbar-header">
           <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
             <span class="icon-bar"></span>
@@ -77,6 +77,9 @@
                 <i class="sprite-icon-dd-tip"></i>
                 <li><a href="/docs/tutorials/">Tutorials</a></li>
 
+                <i class="sprite-icon-dd-tip"></i>
+                <li><a href="/dart-by-example/">Dart by Example</a></li>
+
                 <li class="divider"></li>
                 <li><a href="/docs/">Programmer's Guide</a></li>
                 <li><a href="http://api.dartlang.org">API Reference</a></li>
@@ -144,4 +147,4 @@
       </div><!-- /.container -->
     </div><!-- /.navbar -->
 
-  
+